Reamer.



PATENTED JULY-2, 1907.

c. w. H. POTTER.

BEAMER. APPLIoATIoNrILBD Armas. 1904. nnnnwnn Homan, 190s.

-UNlrrED sTArEsf PATENT oEEroE.

i CHARLES W.. H. POTTER, Olli-DETROIT, MICHIGAN, ASSIGNOR TO MINNIE L.POTTER AND WILLIAM AIKMAN, JRI., OF DETROIT, MICHIGAN.

nnallmn.

Ne. 858,752. f

Specieation of Letters Patent. y

Patented July 2, 1907.

applleeuen sled Aem 25.1904. nenewea November so, 190e;v serlel Ne.345.767.

T o all whom 'it may, comme: Be it known th`at I, ,CHARLES W. H. POTTER,a citizen of the United States of America, residing at De- 'referencebeing had therein the accompanying drawings. l p

This invention relates to improvements in reamers for forming undercutopenings or sockets, and is especially adapted for forming sockets inmarble an'd other or other securing devices thereto, and its object isto provideadevice for the purpose which is cheap to` manufacture,efiicient in its operation, and so `constructed that the opening may bereamed at any depth, the device being of uniform diameter throughout itslength with noprojecting parts to interfere with its .being inserted toany desired depth in an opening.

It is also an object of the invention to provide 'springs for holdingthe cutters retracted when not in use so that they will not interferewith its ready insertion in an opening and'to provide certain 4other newand useful features, all as hereinafter more fully described and showninthe accompanying drawings, in which.-

Figure l, isa side elevation of a device embodying the invention; Fig.2, an end elevation of the lower end of the saine; Fig. 3, alongitudinal section; and Fig. 4, a section on the line :2J-Kx of Fig.3.

As shown in the drawing, 1, is the body which is bored longitudinallyinward from one end to form a socket 2 therein and the opposite or lowerend ofthe same is formed with radial slots 3 extending longi-v tudinallyand meeting the socket. x Within these slots are pivotally securedthevcutters 4 by pins 5 passingvthrough openings in the upper ends ofthe cutters and holes bored in the body at the upper o'r inner ends ofsaid slots, said 4.cutters being provided with cutting edges 6 alongtheir outer edges to engage the side wall of an opening or bored holeand ream out or undercut the same as the cutters are swung outward ontheir pivots.

To drive orrotate the body and, at the same time `force the cuttersoutward, a stem 7, provided with a" squared shank or head 8 to engagethe socket of any ordinary bit stock or similar device and fittingwithin the upper end of the socket 2, is provided to=moveYlongitudinally therein, the same being prevented from Iturning in thesocket by a pin 9 on the stemengaging a longitudinally extending slot 10in the body; and a longitudinally extending rod or reduced portion 11 ofthe stem projecting from the innerrend of the same, is`

provided with a tapering end or point forming a wedge 12-to engage theinner edges of the cutters when the stem is forced inward and turn thecutters on their piva short distance past the pivots of the cutters toallow the wedge to engage the cutters'at a short distance be,- low theirpivots and theieore less force will be reaxial opening of a diameter tot the rod 11 and guide the same. A coiled spring 16 is interposedbetween said washer and the shoulder formed by'the junction of the stemand rod to hold the stem projected from the socket and the wedge liftedout of contact with the cutters. .If the washer is'found unnecessary andis not used, the springmay directly engage the shoulder.

-Flat springs 17 are secured at one end to the cutters, and extendingupward within the bore 13, engage the rod 11 and exert a force to holdthe cutters retracted or within the slots so that they will not swingoutward entering.

Having thus fully described ray-invention, what I claim isz- 1. In areamer, the combinationoi a body of uniform diameter throughout itslength and having a longitudinal bore extending inward from its upperend forming a socket, a cutter carried by said body near its lower endand normally lying`within the same, a stem longitudinally movable insaid socket to move the cutter and extending out through its open end, asquared head'on the louter end of said stem, a spring sleeved on thestem vto normally hold the same projected from the body, andmeaxlsconnecting the stem and body to cause the same tobe turnedtogether.

2. In areamer, the combination of a body having lonlng inward from theopposite end to said slits, cutters pivotaily secured in said slits, Vastem iitting within the outer open end of the body and provided with asquared head, a lreduced end on the stem to engage the cutters, a springsleeved on the reduced portion of the stem within thebore to hold thestem projected from the body and means connecting the stem and body andlimiting the movement of the stem. e y

3. 'In a 'reamei', the combination of a body formed with longitudinal'slits st one end and a bore extending inwardfrom its opposite end andreduced near the slots to forman internal shoulder, cutters plvotallysecured in said slots, a stem lilttillg within the outer end of saidbore and provided withl a squared head outside the body, a reducedportion extending inward from the inner end of the stom to`engagc and'operate the cutters, a. washer engaging the internal shoulder in thebore and provided with an opening within which the reduced portionfits,a

end of the stem at one end andthe washer at the oppo ots. The inner end13 of the bore or socket 2 extends washer 15 may be seated upon saidshoulder having an gitudinai slits. at one end and a longitudinal bor'eextend-.-

when inserting the tool inlan opening and prevent `its loo A springsleeved on the reduced portion `alldengaging the site end, and meansconnecting the stem and body to f'traeted and means `connecting the stemund body whereby limit the longitudinal movement of the stein and causethe body to turn therewith. l

i4. In a reamer, the combination of a body having 1ongitudinal slits atone end and a longitudinal bore extending inward from the opposite endto said slits, cutters pivotally secured in said slits, a stem ttingwithin the outer open end of the body and provided with a ,squared head,a reduced end on the stem t0 engage the cutters, springs -for normallyholding the cutters rethey refreeto have u limited sliding movement inrelution to each other.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES W. H. POTTER.

Witnesses:

THOMAS G. LoNGsTAFir, LEWIS E. FLANDERS.

